==== run-regress-xonly ====
cc -O2 -pipe  -g -Wall -Wpointer-arith -Wuninitialized -Wstrict-prototypes -Wmissing-prototypes -Wunused -Wsign-compare -Wshadow  -MD -MP  -c /home/src/regress/sys/kern/xonly/xonly.c
cc   -o xonly xonly.o 
./xonly
                                      userland     kernel
ld.so                  0xb1ad0d55000  P readable   P unreadable
mmap xz                0xb1b2f0b1000  P unreadable P unreadable
mmap x                 0xb1b5c2dc000  P readable   P readable  
mmap nrx               0xb1af4b22000  P readable   P readable  
mmap nwx               0xb1b25dde000  P readable   P readable  
mmap xnwx              0xb1b2dd64000  P readable   P readable  
main                   0xb1882c1f410  P readable   P unreadable
libc                   0xb1ab9a2e140  P readable   P unreadable